Mm - Min-/Max Function - Eaton easyE4 series Manual

6. Function blocks
6.1 Manufacturer function blocks

6.1.3.5 MM - Min-/Max function

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General
easyE4 base devices provide 32 Min-/Max function blocks,
MM01 through MM32.
These function blocks can be used to determine the maximum
value and the minimum value of a changing analog value. This
makes it, for example, easy to conveniently determine the mag-
nitude of the pressure fluctuations inside a system.
Operating principle
If the function block is enabled, the current value at function block input I1 will be com-
pared with the existing minimum value and maximum value. If the current value falls
below or exceeds these values respectively, it will accordingly be set as the new min-
imum value or maximum value. Only one minimum value and one maximum value will
be stored in the function block at any one time.
Both values will be zero when the measurement starts. Moreover, they can be reset to
zero using the RE input.
You can run the calculation cyclically or only when there are rising edges at function
block input T_. The typical application is monitoring a process value cyclically.
The function block and its parameters
Function block inputs
Description
(Bit)
EN 1: Activates the function block.
ET Enable trigger
0: Calculates Min/Max every time the function
block is called; trigger input T_ is deactivated
1: Calculates Min/Max only when there is a
rising edge at T_; trigger input T_ is activated
T_ Trigger input
Min/Max are calculated when there is a rising
edge at T_, provided that ET = 1
RE 1: Sets the internal Min/Max values to 0
(DWord)
I1 Analog value used for the Min/Max com-
parison
easyE4 11/18 MN050009 EN www.eaton.com
Note
Typically, an ET = 0 automatic trigger con-
figuration is used
The fastest this can be done is every
second cycle, since a switch from 0 to 1
is required at T_.
Integer value range:
-2,147,483,648 to +2,147,483,647